Background defaults to transparent?

[Marc Randolph]

I have a relatively basic setup and recently changed themes. In doing so, now my date and time card looks funny because it appears the bignumber-card defaults to a transparent background while all the other cards do not:

I suspect this is related to what this user is seeing as well: https://community.home-assistant.io/t/lovelace-bignumber-card/59280/28

Thanks!

[Ian Richardson]

you can use card-mod to apply the desired background